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STOCKHOLDERS' EQUITY - Stock options (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Weighted Average Grant Date Fair Value        
Stock options granted     220,000  
Restricted common stock        
Shares of Restricted Common Stock        
Non-vested balance, January 1, 2021     72,500  
Granted     2,570,000  
Vested     27,500  
Non-vested balance, September 30, 2021 2,615,000   2,615,000  
Weighted Average Grant Date Fair Value        
Non-vested balance, January 1, 2021 (in dollars per share)     $ 1.24  
Granted (in dollars per share)     2.55  
Vested (in dollars per share)     2.06  
Non-vested balance, September 30, 2021 (in dollars per share) $ 2.52   2.52  
Stock options.        
Weighted Average Grant Date Fair Value        
Weighted average grant date value $ 1.55   $ 0.80 $ 0.36
Stock options granted   0